My aux cord doesn’t play music

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recently, my Spotify won’t play through my aux cord I have in my car. I had plugged in my cord and started to play my music, but it played through my iphone speakers instead of the car speakers. My friend then took the cord and was able to play music through the car speakers. I had cleaned out my port and still nothing. I don’t think anything is wrong with my port because my phone still charges. Please help I have tried everything I’ve seen online and nothing has worked.